Reverse gear gone

[jfe1]

The reverse gear on my XLT has gone awol. I was backing up with a trailer and moved forward a bit to get the alignment correct, when I put it back into reverse there was nothing, revs up but no drive. Put it back into drive and it goes forward, in reverse, nothing.
Hand a look at the linkage at the column and at the gearbox outer and everything is in place, no links broken.
So now the big $$$$ question, what went wrong inside. There was no jerk, no sound of anything breaking nothing, it's gone, just like that.
Any ideas what might have happened, you tube is not very informative on the transmission issues for our kind. What will this typically involve and what is the estimated worst case cost in your opinions?

 

[stamp11127]

Check the trans fluid level first. If it is within the min/max range then we need to know the year & engine you have.

 

[jfe1]

It's 05 XLT 4x4 with 5.4 V8 motor. Trans fluid is good.

 

[stamp11127]

No Reverse Possible Component Reference/Action

It is safe to say you are probably going inside the transmission to fix the problem.

Engagement Concern: No Reverse Possible Component Reference/Action
202 — ELECTRICAL ROUTINE
· No electrical concerns.

302 — HYDRAULIC/MECHANICAL ROUTINE

Fluid
· Incorrect level
· Adjust fluid to correct level.

· Condition
· Inspect condition of fluid.

Shift Linkage
· Damaged or incorrectly adjusted
· Inspect and repair as required. Verify transmission shift cable adjustment. Refer to Section 307-05 . Adjust transmission shift cable as necessary. After repairing transmission shift cable, verify that the digital TR sensor is correctly adjusted. Adjust the digital TR sensor as necessary. Refer to Transmission Range (TR) Sensor Adjustment in this section.

Incorrect Pressures
· Low reverse clutch pressure, low reverse band pressure, low line pressure
· Check pressure at line pressure tap. Refer to the Line Pressure Chart for specifications. Refer to Special Testing Procedures in this section. If pressures are low, check the following components: oil filter and seal assembly, main controls, reverse servo, pump assembly, reverse clutch assembly.

Fluid Filter and Seal Assembly
· Plugged, damaged
· Install a new filter and seal assembly.

Main Controls
· No. 6 shuttle ball, manual valve, main regulator valve, 1-2 accumulator seals stuck or damaged
· Inspect for damage. Repair as required.

· Loose bolts
· Tighten bolts to specifications.

· Gasket damaged
· Inspect for damage and install a new gasket.

Low/Reverse Servo
· Seals (piston and cover) damaged
· Inspect for damage. Repair as required.

· Servo cover retaining ring damaged

· Anchor pins (case) damaged

Pump Assembly
· Loose bolts
· Tighten bolts to specifications.

· Porosity/cross leaks/ball missing or leaking, plugged hole
· Inspect pump assembly. Install new as required.

· Gasket damaged
· Inspect for damage and install a new gasket.

· No. 1 and 2 seal rings damaged
· Inspect for damage. Repair as required.

Reverse Clutch Assembly
· Seals, piston damaged
· Inspect for damage. Repair as required.

· Check ball missing or damaged

· Friction elements damaged or worn

Low/Reverse Band
· Band, servo, anchor pins damaged or worn
· Inspect for damage. Repair as required.

 

[jfe1]

Thanks for that, gives me good reverence points to work from.